[jira] [Created] (HIVE-17998) Use FastDateFormat instead of SimpleDateFormat for TimestampWritable

[BELUGA BEHR (JIRA)]

BELUGA BEHR created HIVE-17998:
----------------------------------

             Summary: Use FastDateFormat instead of SimpleDateFormat for 
TimestampWritable
                 Key: HIVE-17998
                 URL: https://issues.apache.org/jira/browse/HIVE-17998
             Project: Hive
          Issue Type: Improvement
          Components: Serializers/Deserializers
    Affects Versions: 3.0.0, 2.4.0
            Reporter: BELUGA BEHR
            Priority: Trivial


Currently Hive is using this ThreadLocal/SimpleDateFormat setup to work around 
the thread-safety limitations of SimpleDateFormat.

Let us simply drink the Apache Commons champagne and use thread-safe 
{{org.apache.commons.lang.time.FastDateFormat}} instead.

{code:java|title=org.apache.hadoop.hive.serde2.io.TimestampWritable}
  private static final ThreadLocal<DateFormat> threadLocalDateFormat =
      new ThreadLocal<DateFormat>() {
        @Override
        protected DateFormat initialValue() {
          return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        }
      };
{code}



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